Growing Watermelon

Cucurbitaceae c. lanatus : Cucurbitaceae / the gourd family

Jan F M A M J J A S O N Dec
                S S S S
T                   T T
                    P P

(Best months for growing Watermelon in New Zealand - cool/mountain regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • P = Sow seed
  • Grow in seed trays, and plant out in 4-6 weeks. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 70°F and 95°F. (Show °C/cm)
  • Space plants: 24 - 30 inches apart
  • Harvest in 12-17 weeks.
  • Compatible with (can grow beside): Sweetcorn, Sunflowers
  • Avoid growing close to: Potatoes

Your comments and tips

07 Oct 23, Anonymous (Australia - sub-tropical climate)
You may have to buy from Australia - or try google in NZ
19 Sep 23, Amanda (USA - Zone 8b climate)
I thought my watermelons had died off but in the beginning of this month (September) they decided to start growing again any chance they will actually survive or am I wasting my time?
20 Sep 23, Anonymous (USA - Zone 8b climate)
It does say plant Feb March.
12 Sep 23, Zakes (South Africa - Summer rainfall climate)
Hi. I'm staying in Roodepoort, West of Johannesburg. I'd like to find out what type of watermelons that I can plant in this area. Secondly, what are the biggest and sweetest watermelon type that are suitable for the climate conditions of Roodepoort?. Kind regards Zakes Mahlangu Cell: 082 866 0937 (WhatsApp and Voice)
14 Sep 23, Mike (Australia - sub-tropical climate)
Might be best to pick a variety you like.
05 Sep 23, Babsie (South Africa - Summer rainfall climate)
What makes watermelons to be sugarless
03 Nov 23, Bee-Pie (South Africa - Humid sub-tropical climate)
Watermelon is a desert plant and needs full sun. Watermelons need to produce a lot of leaves to make enough sugar to produce sweet fruit. To do this they need a constant supply of water. It could also be to a nutrient deficiency in your soil.
04 May 23, juan perez (USA - Zone 10a climate)
melons do they grow on the ground or trails
08 May 23, Anonymous (USA - Zone 3b climate)
Ground.
30 Apr 23, Sam (USA - Zone 10a climate)
I’m in zone 10a Rialto ca and I’m wondering if it’s too late to start my watermelon seedling this is my first time ever planting something and I have many many many seeds of multiple vegetables and I have no idea when to start my seeds
Showing 21 - 30 of 350 comments

Amy, When to pick watermelons is one of life's great mysteries, but there are a few tips to help you out...Tapping on a ripe watermelon give a heavier thud than unripe ones, watch out for a yellowing stem, a yellowing patch on the underside where it touches the soil and also the skin gets a more powdery look to it rather than it's normal glossy sheen. I picked a couple before I started to get it right. Another thing is to leave it then for another wekk after you have picked it so that it can finish ripening. good luck

- Grahame

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This planting guide is a general reference intended for home gardeners. We recommend that you take into account your local conditions in making planting decisions. GardenGrow is not a farming or commercial advisory service. For specific advice, please contact your local plant suppliers, gardening groups, or agricultural department. The information on this site is presented in good faith, but we take no responsibility as to the accuracy of the information provided.
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